Health Assessment of Fargesia qinlingensis Forest in Taibaishan National Nature Reserve of the Qinling Mountains,China
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摘要: 太白山国家级自然保护区秦岭箭竹面临成片开花、生长衰退等问题，严重影响大熊猫食物资源。森林健康评价是确定森林资源经营技术和措施的重要依据，有利于森林生态系统的恢复与健康经营。笔者以保护区秦岭箭竹为研究对象，在全面调查生长状况、立地条件的基础上，以环境因子、林分活力、林分结构和干扰强度等为指标，构建秦岭箭竹林健康评价指标模型，运用均方差决策综合分析法进行评价。结果表明：秦岭箭竹林健康评价准则层权重大小排序为林分活力(0.472)＞林分结构(0.203)＞环境因子(0.188)＞干扰强度(0.137)；指标层中土壤质量、年龄结构、生物量、开花率、更新状况和物种多样性对秦岭箭竹林健康的影响较大；在30块样地中，处于优质等级的样地有2块(占6.67%)，良好健康和健康的各3块(各占10.00%)，亚健康的6块(占20.00%)，16块(占53.33%)处于不健康状态。总体来看，太白山国家级自然保护区海塘河沟秦岭箭竹林评价结果为不健康状态，建议从施肥、密度效应、挖鞭(蔸)、土壤改良、降低灌木层盖度等方面进行深入研究，探究开花秦岭箭竹林的更新复壮技术。Abstract: Fargesia qinlingensis in Taibaishan National Nature Reserve of the Qinling Mountains has undergone a growth decline due to the flowering and changing environment,leading to widespread concern about the food resources of giant panda.Forest health evaluation is important for determining forest management technologies,and conducive to the restoration and healthy management of the forest ecosystem.Here,using the health assessment index model,we investigated the environmental factors,stand vitality,forest structure and disturbing intensity to evaluate the growth condition of F.qinlingensis,and performed the mean squared decision analysis to determine the health status of F.qinlingensis forest.The main results were as follows:In the criterion layer,stand vitality (0.472),forest structure (0.203),environmental factors (0.188),and disturbing intensity (0.137) were ranked by criteria weights.In the index layer,soil quality,age structure,biomass,flowering ratio,regeneration status,and species diversity had significant impacts on the health of F.qinlingensis forest.Among the 30 plots surveyed,2 were assessed as "super healthy" (accounting for 6.67% of total),3 plots each were categorized as "quite healthy" and "healthy" (10.00% each),6 were"sub-healthy "(20.00%),and 16 were" not healthy "(53.33%).Therefore,the overall evaluation result was" not healthy".Thorough investigations into fertilization,density effect,removal of bamboo rhizomes and stumps,soil improvement,and reduction of forest coverage were suggested in order to ensure the successful regeneration and rejuvenation of F.qinlingensis forest in Qinling Mountains after flowering.
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Key words:
- Fargesia qinlingensis /
- Health assessment /
- Stand vitality /
- Flowering ratio /
- Regeneration
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